EP2138922B1 - Procédé de commande de ventilateur en fonction de la position d'un dispositif et dispositif mettant en oeuvre la procédure - Google Patents

Procédé de commande de ventilateur en fonction de la position d'un dispositif et dispositif mettant en oeuvre la procédure Download PDF

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Publication number
EP2138922B1
EP2138922B1 EP09163040.0A EP09163040A EP2138922B1 EP 2138922 B1 EP2138922 B1 EP 2138922B1 EP 09163040 A EP09163040 A EP 09163040A EP 2138922 B1 EP2138922 B1 EP 2138922B1
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EP
European Patent Office
Prior art keywords
fan
vertical position
decoder
turned
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09163040.0A
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German (de)
English (en)
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EP2138922A1 (fr
Inventor
Xavier Guitton
Anthony Aubin
Maurice Fritsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
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Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP2138922A1 publication Critical patent/EP2138922A1/fr
Application granted granted Critical
Publication of EP2138922B1 publication Critical patent/EP2138922B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording

Definitions

  • the present invention relates to a control method for a fan according to the horizontal or vertical position of a device.
  • the present invention relates also to a device which implements the method.
  • the manufacturers cut air inlets in the device box to enable the evacuation of the hot hair.
  • a fan is positioned in front of the air inlets to accelerate the exchanges with the exterior and allow correct internal cooling. But using a ventilator at full speed is noisy.
  • the device is a television decoder which can, for example, be located in a bedroom, in this case, it must not disturb the users sleep.
  • the maximum threshold usually authorized is twenty five decibels. This measure is realized according to the Sound Pressure method, i.e. using a microphone positioned at one meter from the front panel of the decoder.
  • the servo system of the fan checks regularly the speed and modulates it according to a directive to be attained.
  • a temperature sensor is positioned in an area of the device that is usually hot. As soon as a temperature threshold is reached or exceeded, the fan speed increases proportionally to the difference between the temperature threshold and the value measured by the sensor. During switching on of the device, the fan is turned on at slow speed, and as soon as the temperature exceeds 50°C inside the device, the fan speed is increased. If a certain rotation speed is exceeded, the device becomes noisy.
  • the fan is fitted with a tachymetric sensor which transmits a signal according to the real speed of the blades.
  • the control unit of the fan analyses the signals coming from the tachymetric sensor and ensures regulation of the fan speed.
  • the regulation is carried out by a of PDI (P for proportional, D for differential and I for integral) type automation. This efficient automation enables precise regulation of the speed, by adjusting the command supplied to the fan according to a directive calculated from values measured by the tachymetric sensor.
  • PDI proportional, D for differential and I for integral
  • the electronic components experiencing difficulties in supporting excessive heat the designers are confronted with the following dilemma: either to privilege the absence of noise and risk an overheating of the components, or to ventilate the interior of the device as well as possible but rendering it noisy.
  • the present invention enables among other things the resolution of the dilemma, at least under certain circumstances.
  • the document US 2007/296408 - LIAO TS-HSINE describes a system for controlling temperature using electronic sensors and a system for controlling a plurality of fans.
  • the sensors are spread over the printed circuit and then provide a mapping of the heat dissipated.
  • Each value is compared with a threshold value associated with the area where the sensor is located, and if the value is exceeded, one or several fans are enabled (to cool the area considered).
  • the document US 6 542 846 - MILLER describes the temperature regulation of a device which comprises batteries. Some sensors measure the heat released by the batteries and according to the measurement, determine if it is necessary to change the cooling-fan control. Several fans can be used to cool specific areas.
  • Document JP H11 -154038 discloses a method according to the preamble of claim 1, and a device according to the preamble of claim 5.
  • One of the purposes of the present invention is a method for controlling the operation of a fan equipping an electronic device, including a step of determining the vertical or horizontal position of the electronic device, the fan not being turned on during the powering up of the device when the device is in vertical position.
  • this position may be sufficient to ensure correct ventilation without the need to turn on the fan.
  • a measurement of the internal temperature is carried out in the device. Whatever the position of the device, the fan is turned on from a determined temperature. In this way, there is no risk of device damage following, for example, blockages of the ventilation air-inlets.
  • a light and/or sound signal is transmitted to indicate that the fan is turned on and that the device is in a vertical position. In this way, the user is informed of a malfunction of the device due to a too high increase in temperature.
  • Another object of the present invention is a device fitted with electronic circuits and a fan for its internal cooling, the device being able to take an horizontal or vertical position; the device including a detector which determines the device position, and a control means which inhibits the start-up of the fan during the powering up of the device when the device is in a vertical position.
  • the device of the invention is further provided with a means for measuring the internal temperature of the device, the fan being turned on when a determined temperature is reached whatever the position of the device.
  • the fan is placed on the side at the bottom of the device in a vertical position, and blows the external air into the device. In this way, the maximum noise generated by the air flow is located inside the device and not outside of the device.
  • the circuits which dissipate the most heat are arranged close to the lower air inlet of the fan when the device is in a vertical position. In this way, the circuits are more efficiently cooled.
  • Figure 1 describes a section of an electronic device, a television decoder for example.
  • the device comprises a printed circuit 1 on which the electronic circuits 2 are arranged.
  • a hard disk 3 enables recording of data, particularly of lengthy audiovisual works.
  • the circuits 2 and the disk 3 consume a lot of power and emanate heat, for example, for a television decoder dissipating 17 Watts, its central processing unit releases itself a heat level of approximately 3 Watts.
  • certain zones of the decoder marked in grey on figure 1 , are warmer than others.
  • a temperature sensor 4 located within one of these hot areas, preferably close to the circuit which produces the most heat, provides a voltage proportional to the temperature.
  • a fan 5 provides cool air from the exterior and transfers it to the decoder cavity via an opening realized on the left side of the device.
  • Several air inlets 6 cut in the decoder box allow the outlet of the hot air, from the underside, the right side and the top. Curved arrows shown on figure 1 show the path of the air flows. The number, the position and the size of the air inlets are important elements of good ventilation, these parameters being well known to those skilled in the art.
  • a device positioning detector 8 is positioned on the decoder printed circuit. Four feet 9 are positioned beneath the device when it is placed on a flat surface, as well as four other feet 9 on the left side.
  • the fan is preferentially positioned by the air inlet on the underside when the decoder is in a vertical position.
  • the noise is mainly generated at the fan air inlets level, where there is a narrowing of the air flow. This noise being added to that generated by the fan, a maximum sound level is measured inside and not outside the decoder.
  • the sound is mitigated by the exiguous air space situated under the decoder, whereas it would be much less if the fan were positioned on the top of the decoder. Care must be taken that the height of the feet 9 ensure a sufficient air intake and do not block a ventilation inlet.
  • FIG. 2 shows a fan control system.
  • the temperature sensor 4, the fan 5 and the positioning detector 8 are connected to a management unit 7.
  • the management unit can be a microcontroller dedicated to the fan control.
  • the management unit 7 can also be a part of the decoder central processing unit. Whatever its nature, the management unit 7 has at least an analog input for the reception of signals from the temperature sensor 4 and two digital inputs to receive the digital signals from the detector 8 and from the tachymetric sensor (these latter signals called "Tachy" are representative of the fan speed).
  • the management unit 7 is equipped with a control output for the control of the fan 5.
  • the microcontroller 7 triggers or does not trigger the fan rotation and determines its set speed to create a cool air flow sufficient to maintain the inside of the decoder below a nominal temperature.
  • the fan is controlled by an analog signal which directly controls the rotation speed of the fan. Measurements have demonstrated a correlation between a number of decibels and a given speed, and thus a control value applied to the fan. It implies then use of the fan only when required and at the lowest possible speed.
  • the positioning detector 8 determines if the decoder is placed in a vertical position or in a horizontal position.
  • the detector is a REED type relay which consists of a mercury drop which moves in a glass tube having two electrodes. If the tube is placed flat, an electric contact can be established between both electrodes. If the tube is in a vertical position, there is no electrical contact.
  • a simple low pressure push-button placed under the decoder can be used, the decoder's weight is sufficient for closing the electrical contact. When the decoder is in a vertical position, the contact is open.
  • step 3.1 the decoder is turned on.
  • the management unit 7 analyses the signal coming from the positioning detector 8 in order to determine if the decoder is in a vertical or horizontal position (step 3.2). If the device is in a horizontal position, the management unit turns on the fan at a minimum speed considering that in any case, it is necessary for correct operation (step 3.3). If the device is detected as being in a vertical position, it is no doubt unnecessary to turn on the fan, as the fireplace effect ensures a minimum air flow between the lower air inlets and the upper air inlets.
  • step 3.4 the management unit analyses the temperature provided by the temperature sensor 4.
  • step 3.5 the temperature measured is compared to a maximum temperature threshold value.
  • This temperature depends on the characteristics of the components which dissipate the most heat, which are generally the central processing units. If the temperature measured is lower than the threshold value, the management program loops at step 3.4, without changing the fan command. However, if the temperature measured is greater than the threshold, the management unit calculates a command value of the fan which depends at least on the temperature measured (step 3.6). In step 3.7, the command value calculated is applied to the fan, thus ensuring an efficient cooling of the components.
  • Figure 4.a shows the decoder in vertical position and figure 4.b in horizontal position.
  • the air flows illustrated by dotted arrows show that the air enters by the lower air inlets and the intermediate air inlets, and mostly exits by the upper air inlet, the rate is sufficient without operation of the fan.
  • the fan 5 sends the cool air from the exterior into the decoder cavity. The input of cool air through the different air inlets 6 cools the interior of the decoder.
  • Decoder in a horizontal position fan turned off 58°C 105°C Decoder in a horizontal position, fan at 2000 rpm 53°C 98°C Decoder in a horizontal position, fan at 4000 rpm 42°C 90°C Decoder in a vertical position, fan turned off 54°C 91°C
  • the measurements carried out show that the temperature of a decoder installed vertically is very close to that of a decoder installed horizontally with a fan operating at low speed.
  • the manufacturers generally ensure the correct operation of a circuit below 100°C measured on the circuit. In the present case, this temperature is not reached when the decoder is in vertical position, fan turned off. If the sensor measures a temperature greater than 54°C, then whatever the position, the fan is turned on.
  • a light indicator a LED diode for example placed on the front panel of the decoder, is controlled by the management unit 7.
  • the indicator light indicates a temperature fault when illuminated. This fault intervenes when the device detects that the decoder is in a vertical position and the temperature measured inside the decoder exceeds the maximum temperature threshold. Thanks to this indication, the user is informed that the air inlets 6 are no longer operational. Thus informed, the user can check that the air inlets are not blocked by an object, or simply by accumulated dust.
  • the indication of such a fault can also be performed via a visual message on a screen linked to the decoder, and/or by a vocal message synthesized by the decoder.
  • the components which dissipate the most heat are positioned at the bottom of the printed circuit when the decoder is in vertical position. Indeed, this part of the decoder is the closest to the cool air intake which benefits most from the "fireplace" effect, which enables a better cooling of the circuits.
  • the circuits should be placed at a maximum of 6 centimeters from the lower air inlet that is to say at least a sixth of the side length.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Control Of Temperature (AREA)

Claims (10)

  1. Procédé pour commander le fonctionnement d'un ventilateur (5) équipant un dispositif électronique, incluant :
    - la détermination de la position verticale ou horizontale du dispositif électronique, le ventilateur n'étant pas activé lors de la mise sous tension du dispositif lorsque le dispositif est détecté comme étant en position verticale ; et caractérisé par
    - la mesure de la température interne du dispositif, quelle que soit la position du dispositif, le ventilateur étant activé à partir d'une température déterminée.
  2. Procédé de commande selon la revendication 1, incluant l'activation du ventilateur à une vitesse minimale lors de la mise sous tension du dispositif lorsque le dispositif est détecté comme étant en position horizontale.
  3. Procédé de commande selon la revendication 1 ou 2, incluant la transmission d'un signal lumineux et/ou sonore indiquant que le ventilateur est activé et que le dispositif est détecté comme étant en position verticale.
  4. Procédé de commande selon l'une des revendications précédentes, dans lequel la détermination de la position verticale ou horizontale du dispositif électronique inclut la mesure de l'état d'un commutateur qui change lorsqu'une partie du poids du dispositif est appliquée sur ledit commutateur.
  5. Dispositif équipé de circuits électroniques (1, 2) et d'un ventilateur (5) pour son refroidissement interne, le dispositif étant capable de prendre une position horizontale ou verticale, incluant :
    - un détecteur (8) déterminant la position du dispositif,
    - un moyen de commande (7) pour empêcher le démarrage du ventilateur pendant la mise sous tension du dispositif lorsque le dispositif est détecté comme étant en position verticale, et caractérisé par
    - un moyen pour mesurer la température interne (4) du dispositif, le ventilateur étant activé lorsqu'une température déterminée est atteinte, quelle que soit la position du dispositif.
  6. Dispositif selon la revendication 5, dans lequel le moyen de commande (7) active le ventilateur (5) à une vitesse minimale lors de la mise sous tension lorsque le dispositif est détecté comme étant en position horizontale.
  7. Dispositif selon la revendication 5 ou 6, incluant un moyen pour transmettre un signal qui peut être perçu par un utilisateur lorsque le ventilateur (5) est activé et que le dispositif est en position verticale.
  8. Dispositif selon l'une des revendications 5 à 7, dans lequel le détecteur (8) est un commutateur dont l'état change lorsqu'une partie du poids du dispositif est appliquée sur ledit commutateur.
  9. Dispositif selon l'une des revendications 5 à 8, dans lequel le ventilateur (5) est positionné sur le côté, au bas du dispositif en position verticale, et souffle l'air extérieur dans le dispositif.
  10. Dispositif selon l'une des revendications 5 à 9, dans lequel les circuits (1, 2) qui dissipent l'essentiel de la chaleur sont positionnés à côté de l'arrivée d'air inférieure (6) du ventilateur (5) lorsque le dispositif est en position verticale.
EP09163040.0A 2008-06-23 2009-06-18 Procédé de commande de ventilateur en fonction de la position d'un dispositif et dispositif mettant en oeuvre la procédure Not-in-force EP2138922B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0854143A FR2932946A1 (fr) 2008-06-23 2008-06-23 Procede de commande d'un ventilateur en fonction de la position d'un appareil, et appareil mettant en oeuvre le procede.

Publications (2)

Publication Number Publication Date
EP2138922A1 EP2138922A1 (fr) 2009-12-30
EP2138922B1 true EP2138922B1 (fr) 2018-05-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09163040.0A Not-in-force EP2138922B1 (fr) 2008-06-23 2009-06-18 Procédé de commande de ventilateur en fonction de la position d'un dispositif et dispositif mettant en oeuvre la procédure

Country Status (6)

Country Link
US (1) US8240978B2 (fr)
EP (1) EP2138922B1 (fr)
JP (1) JP2010004047A (fr)
KR (1) KR20090133091A (fr)
CN (1) CN101615041A (fr)
FR (1) FR2932946A1 (fr)

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US8363411B2 (en) 2011-03-18 2013-01-29 Eldon Technology Limited Passive, low-profile heat transferring system
US8619427B2 (en) 2011-03-21 2013-12-31 Eldon Technology Limited Media content device chassis with internal extension members
US9317079B2 (en) 2011-03-29 2016-04-19 Echostar Uk Holdings Limited Media content device with customized panel
US8681495B2 (en) 2011-03-29 2014-03-25 Eldon Technology Limited Media device having a piezoelectric fan
TWI467354B (zh) * 2011-09-30 2015-01-01 Quanta Comp Inc 電子裝置與溫度調節方法
CN104365187A (zh) 2012-05-03 2015-02-18 爱立信(中国)通信有限公司 用于冷却电信设备的方法和装置
US20140041827A1 (en) * 2012-08-08 2014-02-13 Edward C. Giaimo, III Heat Transfer Device Management
KR20140144464A (ko) * 2013-06-11 2014-12-19 삼성전자주식회사 휴대용 초음파 프로브
FR3015178B1 (fr) 2013-12-13 2016-01-01 Sagemcom Broadband Sas Equipement electronique a double refroidissement
US20170374760A1 (en) * 2015-01-28 2017-12-28 Hewlett-Packard Development Company, L.P. Fan control based on measured heat flux

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JPH10261884A (ja) * 1997-03-17 1998-09-29 Nec Home Electron Ltd 情報処理装置の冷却構造
JPH11154038A (ja) * 1997-11-21 1999-06-08 Matsushita Electric Ind Co Ltd 冷却ファンを有する電子機器

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US20020076213A1 (en) * 2000-11-30 2002-06-20 Pelonis Kosta L. Portable heater
JP2004265373A (ja) * 2003-01-08 2004-09-24 Sony Corp ノイズ低減装置、ノイズ低減方法及びプログラム
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KR100598404B1 (ko) * 2004-11-25 2006-07-07 삼성전자주식회사 냉각팬 제어회로
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JP2007124853A (ja) * 2005-10-31 2007-05-17 Toshiba Corp 情報処理装置およびファン制御方法
TWI285786B (en) * 2005-12-29 2007-08-21 Benq Corp Filtering device and projector utilizing the same
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Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH10261884A (ja) * 1997-03-17 1998-09-29 Nec Home Electron Ltd 情報処理装置の冷却構造
JPH11154038A (ja) * 1997-11-21 1999-06-08 Matsushita Electric Ind Co Ltd 冷却ファンを有する電子機器

Also Published As

Publication number Publication date
US8240978B2 (en) 2012-08-14
CN101615041A (zh) 2009-12-30
US20100111666A1 (en) 2010-05-06
KR20090133091A (ko) 2009-12-31
JP2010004047A (ja) 2010-01-07
FR2932946A1 (fr) 2009-12-25
EP2138922A1 (fr) 2009-12-30

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